100521010209 has 4 divisors (see below), whose sum is σ = 134028013616. Its totient is φ = 67014006804.

The previous prime is 100521010201. The next prime is 100521010211. The reversal of 100521010209 is 902010125001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902010125001 = 3 ⋅300670041667.

It is not a de Polignac number, because 100521010209 - 2³ = 100521010201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100521010201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16753501699 + ... + 16753501704.

It is an arithmetic number, because the mean of its divisors is an integer number (33507003404).

Almost surely, 2^100521010209 is an apocalyptic number.

It is an amenable number.

100521010209 is a deficient number, since it is larger than the sum of its proper divisors (33507003407).

100521010209 is an equidigital number, since it uses as much as digits as its factorization.

100521010209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33507003406.

The product of its (nonzero) digits is 180, while the sum is 21.

The spelling of 100521010209 in words is "one hundred billion, five hundred twenty-one million, ten thousand, two hundred nine".